2009/7/8 अनुज <anuj01@xxxxxxxxx>: > Hi All > > I am trying to map a buffer allocated with kmalloc to user space using > mmap() and immediately unmapping that with munmap() in a loop for some > testing purpose. > > But I get the kernel panic after some time (means after some iterations of > the above loop) with message below : <oops message truncated..> Could you please post or upload the code somewhere? So we all here might have a chance to take a closer look... Meanwhile, my guess is, since you do munmap(), you actually also do kfree() on the kmalloc()-ed page. IIRC, do_unmap in kernel space eventually put the page back to free slab/slub/slob (of its size). In other word, the page is still there, but the address is no longer exist. And this leads to the oops, possibly on the next mmap or munmap. CMIIW people. regards, Mulyadi -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
